5x108 is always a problem. Our company came out with a few new styles this year, and almost nothing for that bolt pattern. We can drill a few 20", but that's awfully big for our cars.
But look at
www.wheelpros.com as well as tsw wheels. MHT may have a few they could drill as well.
Adapters could be a problem, as our cars are already high offset. Since an adapter is going to be at the least a half inch thick, you would have to get a wheel with at least a +50 offset. Or better. Plus, I don't mind adapters on bolts, but as our cars have studs, I would tend to avoid.